Left photos, not even close Right photos are all on borrowed time; not that girls can't in theory age well when plump but that plump is just a step on the road to fat. She's got the bad habits that will make her a landwhale just without the time.
Depends on why she's muscular; if it's an external force that will change - like she's a competitive athlete in a sport that requires muscle and is on a school team then what happens when she's not and she still has the eating habits? Some keep up the discipline, most don't.